JPH0334047Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the welding structure of the internal lead rod of an automotive halogen lamp A. More specifically, a plurality of metal foils 4 are arranged on the same plane, and one An internal lead rod 3 is welded to the front surface 4a of the metal foil 4, and another internal lead rod 3 is welded to the back surface 4b of another metal foil 4, and the filament 1 is installed between the internal lead rods 3. Heat some of the
This relates to a welding structure for an internal lead rod of a halogen lamp, characterized in that a metal foil 4 is embedded in a pinch seal portion 5 of a light bulb body B formed by pressing the heated portion.

For example, halogen lamps for automobile headlights
In the pinch sealing process of A', the lower end of the glass tube is generally heated, and the heated part is pressed with a pincher to seal the long, medium, and short internal lead rods 3a', 3b', and 3.
The metal foil 4' is buried in the pinch seal part 5' together with the welded end of c', but at this time, the metal foil 4' is sandwiched between the heated parts of the glass tube, so the thickness direction of the pinch seal part 5' is It will be located in the center of On the other hand, since the internal lead rods 3a', 3b', 3c' are welded to one side of the metal foil 4', the centers of the internal lead rods 3a', 3b', 3c' and the thick center of the metal foil 4' are does not match. Therefore, during pinch sealing, the internal lead rods 3a', 3b',
The welded end of 3c' is pushed into the inner circumferential surface of one heating part, but the parts of internal lead rods 3a', 3b', 3c' that are out of the metal foil 4' are pinched by the heating part and form a pinch seal part. As a result, the internal lead rods 3a', 3b', and 3c' are tilted with respect to the glass tube of the bulb body B' as shown in Fig. 3. Ta.

The present invention was devised in view of the drawbacks of the conventional examples, and its purpose is to provide a welded structure for the internal lead rod of a halogen lamp, which allows the internal lead rod to be vertically erected by simple means. It is on offer.

The present invention will be described in detail below with reference to illustrated embodiments.
The light-shielding plate 2 is formed by pressing a molybdenum plate, and has a light-shielding recess 8 formed therein, and a flat plate-shaped welded piece 7 extending from the upper edge of the recess 8 . In this embodiment, there are three internal lead rods 3, long, medium, and short, and they are held between quartz pieces 6. The back surface of the recess 8 of the light shielding plate 2 is welded to the tip of the longest internal lead rod 3a. Shortest internal lead rod 3c
A filament 1a for running light is installed between the center part of the longest internal lead rod 3a, and a filament 1b for passing light is installed between the welded piece 7 of the light shielding plate 2 and the medium-length internal lead rod 3b. Each has been constructed. The lower ends of the internal lead rods 3a, 3b, 3c are welded to molybdenum metal foils 4, 4, 4, respectively, and as shown in FIG. Welded to the surface 4a of 4, the central short internal lead rod 3c
may be welded to the back surface 4b of the molybdenum metal foil 4, but of course it is not necessary to weld in a staggered manner as in this case; The other parts may be welded to the back surface 4b of the remaining molybdenum metal foil 4. Further, in this embodiment, a case is shown in which three internal lead rods 3 are used, but it is of course possible to use two internal lead rods. The internal lead rod 3 will be welded to the back surface 4b of the remaining molybdenum metal foil 4. As the number of internal lead rods 3 increases, approximately half of them are placed on the surface 4a of the molybdenum metal foil 4, and the remaining half are placed on the surface 4a of the molybdenum metal foil 4.
Weld the back surfaces 4b of each. In this case, it is desirable that the welded surfaces be staggered. Furthermore, although the external lead rods 9 are welded to the molybdenum metal foil 4, the welding surfaces of the external lead rods 9 do not matter.

Thus, the light shielding plate 2 assembled as described above
Insert the internal lead rods 3a, 3b, 3c, etc. into the glass tube, heat the lower part of the glass tube in a reducing atmosphere, press the heated portion with pinchers, and remove the internal lead rods 3a, 3b, 3c, and the external lead rod 9. The welded portions of are buried in the pinch seal portion 5 together with the molybdenum metal foil 4. In this case, the internal lead rod 3 welded to the front surface 4a side of the molybdenum metal foil 4 and the internal lead rod 3 welded to the back surface 4b side. Since the falling directions are reversed, they cancel each other out, and the internal lead rod 3 stands vertically. Thereafter, the inside of the glass tube is evacuated, then filled with halogen gas, and the chip tube is sealed to form the bulb body B.

As mentioned above, in the present invention, multiple metal foils are arranged on the same plane, an internal lead rod is welded to the surface of one of the metal foils, and another internal lead is welded to the back surface of the other metal foil. Weld the rods, install a filament between the internal lead rods, heat a part of the glass tube,
Metal foil is embedded in the pinch seal part of the bulb body formed by pressing the heated part, so the internal lead rod welded to the front side of the metal foil and the internal lead rod welded to the back side fall in the direction are opposite to each other, and as a result, they cancel each other out and the internal lead rods are vertically erected, which has the advantage of eliminating the drawbacks of the conventional example with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the pinch seal portion of FIG. 1, and FIG. 3 is a sectional view of a portion of a conventional example. 1a is a filament for running light, 1b is a filament for passing light, 2 is a light shielding plate, 3 is an internal lead rod, 4 is metal foil, 4a is the surface of the metal foil, 4b is the back surface of the metal foil, 5 is the pinch seal part, B is a light bulb body.

Claims (1)

[Scope of utility model registration request] A plurality of metal foils are placed on the same plane, an internal lead rod is welded to the surface of one of the metal foils, and another internal lead rod is welded to the back side of the other metal foil. Welding of the internal lead rod of a halogen lamp characterized by embedding metal foil in the pinch seal part of the bulb body, which is formed by installing a filament, heating a part of the glass tube, and pressing the heated part. structure.